SSL/HTTPS Webmail (odd) issue

Question

I am hoping someone on here has experienced an odd issue with SSL/HTTPS when using the webmail URL, in my case, https://my.froxlorserver.com/webmail. I can't prove it for sure however, I believe it is working for some in a different country to me but I can't connect to the above URL using https, it will connect with http on port 80. I get the below error.

Forbidden
You don't have permission to access /webmail on this server.

I have confirmed this on different devices using different internet connections and I have cleared the cache/browsing data.

Using Digicert's tool (https://www.digicert.com/help/) the https://Froxlor admin page comes back as a success with zero issues. If I try https://froxlor/webmail I get the below error message

Error: my.froxlor.com/webmail is not a fully qualified public domain name or public IP address.

The above error message does not make sense as using port 80 I can get to the /webmail page, so the above might be a red herring.

I was then able to connect to the web mail server using https://post.mydomain.com/webmail. I believe, when some were able to access the webmail using https and some were not, the people who were able to were using IPV6 not IPv4.

The problem I have is the comment in that file says not to manually updated the file as it will be overwritten, as per the below.

# 10_froxlor_ipandport_X.X.X.X.443.conf
# Created 19.09.2017 10:10
# Do NOT manually edit this file, all changes will be deleted after the next domain change at the panel.

I have installed the latest version of Froxlor (0.10.12) on my Ubuntu 18.04 server and after tweaking the settings and running the configuration, everything is working beautifully.
However, I noticed that there are options for specifying URLs for PHPMyAdmin, WebMail and WebFTP within the Panel Settings section but I can't seem to figure out how to integrate the three with Froxlor.

Right now, I want to integrate Roundcube as my server's webmail client and any recommended client for webftp, but I'm not so sure how to go about it? What changes should I make to my server or to my Froxlor settings?

I have already run the configuration for FTP-Server(Proftpd), Mailserver(SMTP) as well as Mailserver(IMAP/POP3) and have set the "FTP Server" to Proftpd in the FTP Server settings section and the "Type of the Mail Delivery Server" and "Type of the Mail Transfer Agent" to Dovecot and Postfix respectively in the Mailserver settings section.

Hi,
Our froxlor server is behiend NAT and it uses the local IP 192.168.73.40. We have enabled letsencrypt module in froxlor and tried validating SSL for a domain in the server. SSL generation is getting failed with 403 error. See the debug log information. Replaced domain name and main IP. Can any one help me regarding the issue.

Hi,
I have a domain equipped with a certificate from LE. The cert is valid another 2 months. Now I added a domain as an alias of the existing domain, but the certificate isn't updated to have the new domain as its SAN.
How do I trigger getting a new and updated certificate? Should I delete the existing one?
Thanks for helping out.